CVE-2025-2996
📋 TL;DR
This vulnerability in Tenda FH1202 routers allows attackers to bypass access controls on the web management interface's SysToolDDNS component. Attackers can exploit this remotely to potentially gain unauthorized access to router settings. Users running affected firmware versions are at risk.
💻 Affected Systems
- Tenda FH1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing configuration changes, DNS hijacking, or network traffic interception
Likely Case
Unauthorized access to router management functions, potentially enabling further attacks on internal network
If Mitigated
Limited impact if router is behind firewall with restricted WAN access
🎯 Exploit Status
Exploit details publicly disclosed, making weaponization likely
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware
3. Access router admin panel
4. Upload and apply firmware update
5. Reboot router
🔧 Temporary Workarounds
Disable WAN access to admin interface
allPrevent remote exploitation by disabling external access to router management
Access router settings > Administration > Remote Management > Disable
Change default admin credentials
allMitigate impact if attacker gains access
Access router settings > System Tools > Password > Set strong password
🧯 If You Can't Patch
- Isolate router on separate VLAN with restricted access
- Implement network firewall rules to block access to router management interface from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel under System StatusCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than 1.2.0.14(408) and test access to /goform/SysToolDDNS📡 Detection & Monitoring
Log Indicators:
- Unusual access to /goform/SysToolDDNS endpoint
- Multiple failed login attempts followed by successful access
Network Indicators:
- HTTP requests to router IP on port 80/443 with SysToolDDNS in URL
- Unusual outbound DNS traffic from router
SIEM Query:
source="router-logs" AND (url="/goform/SysToolDDNS" OR (event="login" AND result="success" AND source_ip="external"))